Crossword Genius

Top class piece? Back bone? (5)

Ross

I believe the answer is:

tibia

'bone?' is the definition.
(I know that tibia is a bone)

'top class piece? back' is the wordplay.
'top class' becomes 'AI' (resembles Ab, old-fashioned term meaning excellent).
'piece?' becomes 'bit' (synonyms).
'back' says the letters should be written in reverse.
'ai'+'bit'='aibit'
'aibit' backwards is 'TIBIA'.

(Other definitions for tibia that I've seen before include "Part of leg of" , "The large shinbone" , "Bone of the lower leg" , "ancient pipe" , "part of skeleton" .)

I've seen this clue in the Sydney Morning Herald.
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